Under the performance standards for ARPA, after a target has been acquired, the system must present an indication of the target's motion trend within what time period?

Why B is correct

Per 33 CFR §164.38, Appendix A, paragraph 3.4.12, the ARPA must present an indication of the target's motion trend within not more than one minute of acquisition. Full predicted motion must be displayed within three minutes, but the motion trend indication is required within one minute.